Hi DjDiabolik, Do you mean the WDTV Play or that PS3 Media Server is not supported, because as I mentioned it plays the file in question both over USB and while using a different DLNA server.
In any case, here is the MediaInfo on the problem file not working using PS3 Media Server
General
Unique ID : 176462790869914792780944008680558798019 (0x84C17F4F1870F007A298E1855347A4C3)
Complete name : /Volumes/Movies/2013/WithHeld.mkv
Format : Matroska
Format version : Version 4 / Version 2
File size : 974 MiB
Duration : 2h 18mn
Overall bit rate : 986 Kbps
Movie name : [Deleted]
Encoded date : UTC 2014-02-28 05:18:27
Writing application : mkvmerge v6.6.0 (‘The Edge Of The In Between’) built on Dec 1 2013 17:55:00
Writing library : libebml v1.3.0 + libmatroska v1.4.1
Video
ID : 2
Format : AVC
Format/Info : Advanced Video Codec
Format profile : High@L4.1
Format settings, CABAC : Yes
Format settings, ReFrames : 4 frames
Codec ID : V_MPEG4/ISO/AVC
Duration : 2h 18mn
Nominal bit rate : 890 Kbps
Width : 1 280 pixels
Height : 534 pixels
Display aspect ratio : 2.40:1
Frame rate mode : Constant
Frame rate : 23.976 fps
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.054
Writing library : x264 core 135 r2 f0c1c53
Encoding settings : cabac=1 / ref=4 / deblock=1:-1:-1 / analyse=0x3:0x133 / me=umh / subme=9 / psy=1 / psy_rd=1.00:0.15 / mixed_ref=1 / me_range=24 / chroma_me=1 / trellis=2 / 8x8dct=1 / cqm=0 / deadzone=21,11 / fast_pskip=0 / chroma_qp_offset=-3 / threads=36 / lookahead_threads=3 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / bluray_compat=0 / constrained_intra=0 / bframes=3 / b_pyramid=2 / b_adapt=2 / b_bias=0 / direct=3 / weightb=1 / open_gop=0 / weightp=2 / keyint=250 / keyint_min=23 / scenecut=40 / intra_refresh=0 / rc_lookahead=60 / rc=2pass / mbtree=1 / bitrate=890 / ratetol=1.0 / qcomp=0.60 / qpmin=0 / qpmax=69 / qpstep=4 / cplxblur=20.0 / qblur=0.5 / vbv_maxrate=31250 / vbv_bufsize=31250 / nal_hrd=none / ip_ratio=1.40 / aq=1:1.00
Default : Yes
Forced : No
Color primaries : BT.709
Matrix coefficients : BT.709
Audio
ID : 3
Format : AAC
Format/Info : Advanced Audio Codec
Format profile : LC
Codec ID : A_AAC
Duration : 2h 18mn
Channel(s) : 2 channels
Channel positions : Front: L R
Sampling rate : 48.0 KHz
Compression mode : Lossy
Language : English
Default : Yes
Forced : No
Text
ID : 1
Format : UTF-8
Codec ID : S_TEXT/UTF8
Codec ID/Info : UTF-8 Plain Text
Title : [Deleted]
Default : Yes
Forced : No
Here is a working file:
General
Unique ID : 230607891403297719105362758153203012499 (0xAD7D76DF6A8DE460812837FDF96ED393)
Complete name : /Volumes/Movies/2013/WithHeld.mkv
Format : Matroska
Format version : Version 2
File size : 999 MiB
Duration : 2h 10mn
Overall bit rate : 1 070 Kbps
Movie name : WithHeld 3 BluRay 720p Ganool
Encoded date : UTC 2013-08-20 07:22:04
Writing application : mkvmerge v5.7.0 (‘The Whirlwind’) built on Jul 8 2012 20:08:51
Writing library : libebml v1.2.3 + libmatroska v1.3.0
Video
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : High@L3.1
Format settings, CABAC : Yes
Format settings, ReFrames : 4 frames
Codec ID : V_MPEG4/ISO/AVC
Duration : 2h 10mn
Nominal bit rate : 1 004 Kbps
Width : 1 280 pixels
Height : 534 pixels
Display aspect ratio : 2.40:1
Frame rate mode : Constant
Frame rate : 23.976 fps
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.061
Writing library : x264 core 125 r2208 d9d2288
Encoding settings : cabac=1 / ref=3 / deblock=1:-1:-1 / analyse=0x3:0x113 / me=umh / subme=9 / psy=1 / psy_rd=0.00:0.00 / mixed_ref=1 / me_range=32 / chroma_me=1 / trellis=2 / 8x8dct=1 / cqm=0 / deadzone=21,11 / fast_pskip=0 / chroma_qp_offset=0 / threads=12 / lookahead_threads=2 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / bluray_compat=0 / constrained_intra=0 / bframes=3 / b_pyramid=2 / b_adapt=2 / b_bias=0 / direct=3 / weightb=1 / open_gop=0 / weightp=2 / keyint=250 / keyint_min=25 / scenecut=40 / intra_refresh=0 / rc_lookahead=60 / rc=2pass / mbtree=1 / bitrate=1004 / ratetol=1.0 / qcomp=0.60 / qpmin=10 / qpmax=51 / qpstep=4 / cplxblur=20.0 / qblur=0.5 / ip_ratio=1.40 / aq=1:1.00
Default : Yes
Forced : No
Audio
ID : 2
Format : AAC
Format/Info : Advanced Audio Codec
Format profile : HE-AAC / LC
Codec ID : A_AAC
Duration : 2h 10mn
Channel(s) : 2 channels
Channel positions : Front: L R
Sampling rate : 48.0 KHz / 24.0 KHz
Compression mode : Lossy
Language : English
Default : Yes
Forced : No
Menu
00:00:00.000 : en:00:00:00.000
00:04:52.751 : en:00:04:52.751
00:07:55.433 : en:00:07:55.433
00:12:12.440 : en:00:12:12.440
00:19:04.101 : en:00:19:04.101
00:23:47.885 : en:00:23:47.885
00:29:47.703 : en:00:29:47.703
00:39:46.384 : en:00:39:46.384
00:45:56.045 : en:00:45:56.045
00:59:19.639 : en:00:59:19.639
01:01:56.922 : en:01:01:56.922
01:09:24.452 : en:01:09:24.452
01:18:41.508 : en:01:18:41.508
01:23:52.945 : en:01:23:52.945
01:37:55.995 : en:01:37:55.995
01:56:18.305 : en:01:56:18.305
01:59:38.755 : en:01:59:38.755